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Application of a Numerical Code Based on Smoothed Particle Hydrodynamics to Estimate Stresses in Granular Backfilled Openings

Armel Stanislas Nabolle

Master's thesis (2022)

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Abstract

moothed particle hydrodynamics (SPH) method has been used in this thesis to study the backfilling process of a backfilled rock stope. The SPH method has the advantage of discretizing the backfill material into particles interacting with each other, thus simulating the granular particles of the backfill and making it possible to reproduce the backfilling process. Three models were constructed using Abaqus software (2020) to study the effect of the backfilling process and deposition mode. The first model is an SPH model with a wished-in-place backfill representing the backfill material already in place in the rock stope. The second model is a FEM model with also a wished-in-place backfill: this model will serve as a comparison model because it represents the simulations generally carried out for this type of problems. The third model is an SPH analysis representing a uniform, continuous and progressive backfilling process. This model is composed of two backfilling modes: the first one taking place along the longitudinal direction of the stope and the second one along the transversal direction. Several backfilling velocities were also considered in the analyses. The results of these models were compared with each other and with the analytical results developed by Li and Aubertin (2008). The results of these simulations reveal that the contact pressure (CPRESS) distribution at the end of the backfilling process depends on several factors and a new state of interfacial contact stresses, and a dense gathering of particles can occur due to a rearrangement of the particles. In general, and for a specific initial mesh density, it is expected that values of CPRESSs increase when the initial mesh density decrease. It is also expected that values of CPRESSs increase when the backfilling velocity increase and values of CPRESSs are higher for a backfilling process in the transversal direction. For the backfilling process in the transversal direction, an arching effect is observed and is conditioned by the location of the vertical stopes where a stress transfer between the stiff backfill material and the stiffer surrounding rock mass due to friction at the interface of the two materials reduces the pressure and the stress near the stope-walls.

Résumé

La méthode des particules lissées SPH (Smoothed particle hydrodynamics) a été utilisée dans cette étude afin d'étudier le processus de remblayage dans une tranchée rocheuse. Elle a pour avantage de discrétiser le remblai en particules qui interagissent entre elles, simulant ainsi les particules granulaires du remblai et permettant de reproduire le processus de remblayage effectué sur les chantiers de construction. Trois modèles ont été reproduits avec le logiciel Abaqus 2020 de la suite Simulia afin d'étudier l'effet du mode de déposition d'un matériau granulaire dans une tranchée rocheuse. Le premier modèle est un modèle SPH avec remblai déjà placé à l'endroit désiré simulant ainsi la configuration finale du remblai en place dans la tranchée rocheuse. Le second modèle est un modèle utilisant la méthode des éléments finis FEM avec remblai à l'endroit désiré simulant également la configuration finale du remblai : ce modèle représente un modèle de base pour comparaison car il correspond aux simulations effectuées généralement pour ce genre de problèmes. Le troisième modèle est une analyse avec la méthode des particules lissées SPH qui représente un processus de remblayage uniforme, continu et progressif. Ce modèle est composé de deux modes de remblayage : le premier s'effectue dans le sens de la direction longitudinale de la tranchée et le second dans la direction transversale. Plusieurs vitesses de remblayage ont également été considérées dans les analyses. Les résultats de ces modèles ont été comparées entre eux ainsi qu'avec les résultats analytiques développées par Li and Aubertin (2008).

Department: Department of Civil, Geological and Mining Engineering
Program: Génie civil
Academic/Research Directors: Vincenzo Silvestri and Ghassan Abou-Samra
PolyPublie URL: https://publications.polymtl.ca/10443/
Institution: Polytechnique Montréal
Date Deposited: 01 Feb 2023 14:27
Last Modified: 07 Feb 2024 05:26
Cite in APA 7: Nabolle, A. S. (2022). Application of a Numerical Code Based on Smoothed Particle Hydrodynamics to Estimate Stresses in Granular Backfilled Openings [Master's thesis, Polytechnique Montréal]. PolyPublie. https://publications.polymtl.ca/10443/

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